3D printing is a new technology that builds up physical objects layer by layer based on a 3D digital model. It allows for the creation of complex objects from a variety of materials, including plastics, metals, food, and bio materials. Some key applications of 3D printing include rapid prototyping, mass customization, architectural designs, dental applications, clothing, rocket engine parts, and bio printing of living organs. The future scope of 3D printing includes using it to print houses and entire buildings, as well as for space exploration through technologies like bio printing.